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Disconnect the negative battery cable then unplug the BCM-be advised disconnecting the battery causes the computer to lose its memories and vehicle may have to undergo a computer relearning.

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Thursday, March 10th, 2011 AT 7:43 PM

CARADIODOC

EXPERT

Hold on! Let the dealer take on the responsibility! ALL of the other computers on the car are tied to the body computer which has the vehicle ID number programmed in. If the new computer is not programmed properly the first time, all of the other computers will have to be replaced and programmed by the dealer. It is that type of business practice that makes GM so profitable. It is also possible that someone in the past pressed the "lock" function on the GM scanner. You would not notice anything with the operation of the car, until you have to replace the body computer. There is no way to undo that lock procedure. It electronically locks every computer module on the car to that body computer. It makes every one of them worthless as far as installing them on a different car because they can not be reprogrammed. (How does that benefit the customer)? If that lock button was pressed, you will have to replace every computer on the car along with the body computer. (There can be up to forty seven computers at last count). Also, most body computers are built into the radios now on GM vehicles since 2002 models. That is to prevent you from buying an aftermarket replacement radio. You are tied to the dealer and their very expensive repair centers. There is a reason GM was having trouble selling to repeat customers.